Rotatable fan



FIG. 1 is a top front perspective view of my new design for a rotatable fan;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevation view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line showing of a fan grill is included for the purpose of illustrating environmental structure and forms no part of the claimed design. 

The ornamental design for a rotatable fan, as shown and described. 